Interesting. Thanks for the report.
Did you bleed out the old fluid?
I went ahead and flushed the entire system just to be sure. None of the fluid looked darker than new but I didn't want to take any chances.Ya....change fluid if it looks different (darker) than new fluid. Take a sample at the hot caliper bleed port. Bleeding it all out of the calipers may be enough. Keep going until the fluid goes to normal color.
Unfortunately I have to eat a little humble pie today.
A long while ago Alex had commented that the residual valves supplied with the SLC are junk. He didn't go into details and my valves tested OK before I installed them so I went ahead and built the car with the original residual valves. Both my valves had the arrow pointing in the direction opposite of fluid flow (maybe they're supposed to indicate the direction of the MC?). Maybe that should have been the tip off ...